Windows 10 installed on 75 million devices after just a month of availability

The free upgrade from Windows 7 and 8 to Windows 10 is doing wonders: In just under a month of general availability, Windows 10 is now running on 75 million devices.

Unsurprisingly, Windows 10 appears to be doing better than Windows 8: back in 2012, only 40 million Windows 8 licences were sold in the first month of availability. After six months, Windows 8 had risen to 100 million licences sold—but "sold" is likely to be a very different figure from how many devices were actually running Windows 8.